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Securities (Tables) | 12 Months Ended
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Dec. 31, 2016
Investments Debt And Equity Securities [Abstract] |
Summary of Securities Held for Investment and Securities Available for Sale | The following table summarizes securities held for investment and securities available for sale:
|  | December 31, |
|  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Held for investment, at cost (fair value: $4,403 and $8,850, respectively) |  | $ | 4,365 |  |  | $ | 8,789 |
Available for sale, at fair value |  |  | 465,468 |  |  |  | 544,160 |
Total |  | $ | 469,833 |  |  | $ | 552,949 |
Summary of Amortized Cost and Estimated Fair Values of Securities Held for Investment | The following table summarizes the amortized cost and estimated fair values of securities held for investment:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage backed securities (1) |  | $ | 252 |  |  | $ | 17 |  |  | $ | — |  |  | $ | 269 |
States and political subdivisions |  |  | 3,613 |  |  |  | 25 |  |  |  | (4 | ) |  |  | 3,634 |
Other securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total |  | $ | 4,365 |  |  | $ | 42 |  |  | $ | (4 | ) |  | $ | 4,403 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage backed securities (1) |  | $ | 347 |  |  | $ | 25 |  |  | $ | — |  |  | $ | 372 |
States and political subdivisions |  |  | 7,942 |  |  |  | 36 |  |  |  | — |  |  |  | 7,978 |
Other securities |  |  | 500 |  |  |  | — |  |  |  | — |  |  |  | 500 |
Total |  | $ | 8,789 |  |  | $ | 61 |  |  | $ | — |  |  | $ | 8,850 |
Summary of Amortized Cost and Estimated Fair Values of Securities Available for Sale | The following table summarizes the amortized cost and estimated fair values of securities available for sale:
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 268,763 |  |  | $ | 700 |  |  | $ | (920 | ) |  | $ | 268,543 |
U.S. federal agencies |  |  | 129,674 |  |  |  | 373 |  |  |  | (405 | ) |  |  | 129,642 |
Mortgage backed securities (1) |  |  | 19,949 |  |  |  | 290 |  |  |  | (567 | ) |  |  | 19,672 |
States and political subdivisions |  |  | 40,335 |  |  |  | 836 |  |  |  | (129 | ) |  |  | 41,042 |
Other securities (2) |  |  | 6,594 |  |  |  | 125 |  |  |  | (150 | ) |  |  | 6,569 |
Total |  | $ | 465,315 |  |  | $ | 2,324 |  |  | $ | (2,171 | ) |  | $ | 465,468 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 328,965 |  |  | $ | 776 |  |  | $ | (45 | ) |  | $ | 329,696 |
U.S. federal agencies |  |  | 131,522 |  |  |  | 527 |  |  |  | (153 | ) |  |  | 131,896 |
Mortgage backed securities (1) |  |  | 21,973 |  |  |  | 425 |  |  |  | (543 | ) |  |  | 21,855 |
States and political subdivisions |  |  | 49,521 |  |  |  | 1,447 |  |  |  | (48 | ) |  |  | 50,920 |
Other securities (2) |  |  | 9,689 |  |  |  | 249 |  |  |  | (145 | ) |  |  | 9,793 |
Total |  | $ | 541,670 |  |  | $ | 3,424 |  |  | $ | (934 | ) |  | $ | 544,160 |
(1) | Primarily consists of FHLMC, FNMA, GNMA and mortgage backed securities through U.S. agencies.
(2) | Primarily consists of equity securities.
Maturity of Securities | The maturities of securities held for investment and available for sale are summarized in the following table using contractual maturities. Actual maturities may differ from contractual maturities due to obligations that are called or prepaid. For purposes of the maturity table, mortgage-backed securities, which are not due at a single maturity date, have been presented at their contractual maturity.
|  | December 31, |
|  | 2016 |  |  | 2015 |
|  | Amortized Cost |  |  | Estimated Fair Value |  |  | Amortized Cost |  |  | Estimated Fair Value |
|  | (Dollars in thousands) |
Held for Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 1,561 |  |  | $ | 1,568 |  |  | $ | 5,168 |  |  | $ | 5,174 |
After one year but within five years |  |  | 1,937 |  |  |  | 1,951 |  |  |  | 2,800 |  |  |  | 2,829 |
After five years but within ten years |  |  | 707 |  |  |  | 723 |  |  |  | 795 |  |  |  | 319 |
After ten years |  |  | 160 |  |  |  | 161 |  |  |  | 26 |  |  |  | 528 |
Total |  | $ | 4,365 |  |  | $ | 4,403 |  |  | $ | 8,789 |  |  | $ | 8,850 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual maturity of debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Within one year |  | $ | 66,542 |  |  | $ | 66,662 |  |  | $ | 272,820 |  |  | $ | 272,779 |
After one year but within five years |  |  | 320,150 |  |  |  | 319,839 |  |  |  | 178,617 |  |  |  | 180,145 |
After five years but within ten years |  |  | 5,830 |  |  |  | 6,152 |  |  |  | 8,483 |  |  |  | 9,075 |
After ten years |  |  | 66,199 |  |  |  | 66,246 |  |  |  | 75,522 |  |  |  | 75,853 |
Total debt securities |  |  | 458,721 |  |  |  | 458,899 |  |  |  | 535,442 |  |  |  | 537,852 |
Other securities |  |  | 6,594 |  |  |  | 6,569 |  |  |  | 6,228 |  |  |  | 6,308 |
Total |  | $ | 465,315 |  |  | $ | 465,468 |  |  | $ | 541,670 |  |  | $ | 544,160 |
Proceeds from Sales and Realized Securities Gains and Losses, on Available for Sale Securities | The following is a detail of proceeds from sales and realized securities gains and losses, on available for sale securities:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | (Dollars in thousands) |
Proceeds |  | $ | 481 |  |  | $ | 10,850 |  |  | $ | 4,855 |
Gross gains realized |  |  | 227 |  |  |  | 9,394 |  |  |  | 1,641 |
Gross losses realized |  |  | 286 |  |  |  | 125 |  |  |  | — |
Company's Book Value of Pledged Securities | The following table is a summary of the Company’s book value of securities that were pledged as collateral for public funds on deposit, repurchase agreements and for other purposes as required or permitted by law:
|  | Year Ended December 31, |
|  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Book value of pledged securities |  | $ | 439,692 |  |  | $ | 493,540 |
Summary of Securities with Unrealized Losses, Segregated by Duration of Unrealized Loss | The following table summarizes securities with unrealized losses, segregated by the duration of the unrealized loss, at December 31, 2016 and 2015 respectively:
|  | Less than 12 Months |  |  | More than 12 Months |  |  | Total |
|  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |  |  | Estimated Fair Value |  |  | Unrealized Losses |
|  | (Dollars in thousands) |
December 31, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage backed securities |  | $ | 7 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |  |  | $ | 16 |  |  | $ | — |
States and political subdivisions |  |  | 476 |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | 476 |  |  |  | 4 |
Total |  | $ | 483 |  |  | $ | 4 |  |  | $ | 9 |  |  | $ | — |  |  | $ | 492 |  |  | $ | 4 |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 103,705 |  |  | $ | 920 |  |  | $ | — |  |  | $ | — |  |  | $ | 103,705 |  |  | $ | 920 |
U.S. federal agencies |  |  | 71,511 |  |  |  | 357 |  |  |  | 9,619 |  |  |  | 48 |  |  |  | 81,130 |  |  |  | 405 |
Mortgage backed securities |  |  | 3 |  |  |  | — |  |  |  | 14,834 |  |  |  | 567 |  |  |  | 14,837 |  |  |  | 567 |
States and political subdivisions |  |  | 15,289 |  |  |  | 62 |  |  |  | 779 |  |  |  | 67 |  |  |  | 16,068 |  |  |  | 129 |
Other securities |  |  | — |  |  |  | — |  |  |  | 589 |  |  |  | 150 |  |  |  | 589 |  |  |  | 150 |
Total |  | $ | 190,508 |  |  | $ | 1,339 |  |  | $ | 25,821 |  |  | $ | 832 |  |  | $ | 216,329 |  |  | $ | 2,171 |
December 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Held for Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage backed securities |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  | $ | — |
States and political subdivisions |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total |  | $ | 21 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 21 |  |  | $ | — |
Available for Sale |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. treasuries |  | $ | 139,762 |  |  | $ | 45 |  |  | $ | — |  |  | $ | — |  |  | $ | 139,762 |  |  | $ | 45 |
U.S. federal agencies |  |  | 46,948 |  |  |  | 118 |  |  |  | 5,969 |  |  |  | 35 |  |  |  | 52,917 |  |  |  | 153 |
Mortgage backed securities |  |  | 59 |  |  |  | — |  |  |  | 14,844 |  |  |  | 543 |  |  |  | 14,903 |  |  |  | 543 |
States and political subdivisions |  |  | 1,932 |  |  |  | 47 |  |  |  | 245 |  |  |  | 1 |  |  |  | 2,177 |  |  |  | 48 |
Other securities |  |  | 304 |  |  |  | 142 |  |  |  | 105 |  |  |  | 3 |  |  |  | 409 |  |  |  | 145 |
Total |  | $ | 189,005 |  |  | $ | 352 |  |  | $ | 21,163 |  |  | $ | 582 |  |  | $ | 210,168 |  |  | $ | 934 |

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